Indigo dye process
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United States of America Patent
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Mar 18, 1997
Issued Date -
N/A
app pub date -
Apr 29, 1996
filing date -
May 10, 1993
priority date (Note) -
Expired
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Abstract
This invention provides processes for dyeing fibers with indigo including placing the fibers in a substantially enclosed compartment of a commercial dye apparatus, which is equipped with means for introducing a non-oxidizing gas into the compartment; prior to or following placing the fibers in the compartment, introducing a non-oxidizing gas into the compartment to produce a substantially non-oxidizing atmosphere therein; contacting the fibers with a dye liquor comprising leuco indigo in the compartment such that the leuco (reduced) indigo is taken up by the fibers; and oxidizing the leuco indigo taken up by the fibers to produce a blue color in the fibers.
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